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/*
* JLasso -- Java bindings for Lasso library
*
* Copyright (C) 2004 Entr'ouvert
* http://lasso.entrouvert.org
*
* Authors: Benjamin Poussin <poussin@codelutin.com>
* Emmanuel Raviart <eraviart@entrouvert.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <helper.h>
void * getObjectRef(JNIEnv * env, jobject this, const char * name){
jclass clazz;
jfieldID fid;
jlong result;
clazz = (*env)->GetObjectClass(env, this);
fid = (*env)->GetFieldID(env, clazz, name, "J");
result = (*env)->GetLongField(env, this, fid);
return (void*)(long)result;
}
void setObjectRef(JNIEnv * env, jobject this, const char * name, void * objectRef){
jclass clazz;
jfieldID fid;
jlong ref;
clazz = (*env)->GetObjectClass(env, this);
fid = (*env)->GetFieldID(env, clazz, name, "J");
ref = (jlong)(long)objectRef;
(*env)->SetLongField(env, this, fid, ref);
}
void storeCObject(JNIEnv * env, jobject this, void * cobject){
setObjectRef(env, this, "c_lasso_object", cobject);
}
void* getCObject(JNIEnv * env, jobject this){
return getObjectRef(env, this, "c_lasso_object");
}
jobject getJavaObjectField(JNIEnv * env, jobject this, const char * fieldName, const char * fieldType){
jclass clazz;
jfieldID fid;
jobject result;
clazz = (*env)->GetObjectClass(env, this);
fid = (*env)->GetFieldID(env, clazz, fieldName, fieldType);
result = (*env)->GetObjectField(env, this, fid);
return result;
}
void setJavaObjectField(JNIEnv * env, jobject this, const char * fieldName, const char * fieldType, jobject value){
jclass clazz;
jfieldID fid;
clazz = (*env)->GetObjectClass(env, this);
fid = (*env)->GetFieldID(env, clazz, fieldName, fieldType);
(*env)->SetObjectField(env, this, fid, value);
}
jobject instanciate(JNIEnv * env, const char * className){
jclass clazz;
jmethodID constructor;
jobject result;
clazz = (*env)->FindClass(env, className);
if (clazz == NULL) {
return NULL; /* exception thrown */
}
constructor = (*env)->GetMethodID(env, clazz, "<init>", "()V");
if (constructor == NULL) {
return NULL; /* exception thrown */
}
result = (*env)->NewObject(env, clazz, constructor);
(*env)->DeleteLocalRef(env, clazz);
return result;
}
int isSameObject(JNIEnv * env, jobject javaObject, void* cObject){
return javaObject != NULL && cObject == getCObject(env, javaObject);
}
void checkAndSetField(JNIEnv * env, jobject this, char * fieldName,
char * fieldType, char * javaObjectClassName, void * cObject){
jobject javaObject;
/* check if change are made */
javaObject = getJavaObjectField(env, this, fieldName, fieldType);
if(isSameObject(env, javaObject, cObject)){
/* no change made, do nothing */
return;
}
javaObject = instanciate(env, javaObjectClassName);
if(javaObject == NULL){
return; /* exception thrown */
}
/* associate C object with JavaObject */
storeCObject(env, javaObject, cObject);
setJavaObjectField(env, this, fieldName, fieldType, javaObject);
}
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